/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.zxing.decoding;

import java.util.Hashtable;
import java.util.Vector;
import java.util.concurrent.CountDownLatch;

import android.app.Activity;
import android.os.Handler;
import android.os.Looper;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.ResultPointCallback;
import com.zxing.i.ZXingInterface;

/**
 * This thread does all the heavy lifting of decoding the images.
 */
final class DecodeThread extends Thread
{

    public static final String BARCODE_BITMAP = "barcode_bitmap";

    public static final String BARCODE_SCALED_FACTOR = "barcode_scaled_factor";

    private final Activity activity;

    private final Hashtable<DecodeHintType, Object> hints;

    private Handler handler;

    private final CountDownLatch handlerInitLatch;

    private ZXingInterface zxingInterface;

    DecodeThread(Activity activity, Vector<BarcodeFormat> decodeFormats,
            String characterSet, ResultPointCallback resultPointCallback,
            ZXingInterface inter)
    {
        zxingInterface = inter;
        this.activity = activity;
        handlerInitLatch = new CountDownLatch(1);

        hints = new Hashtable<DecodeHintType, Object>(3);

        if (decodeFormats == null || decodeFormats.isEmpty())
        {
            decodeFormats = new Vector<BarcodeFormat>();
            decodeFormats.addAll(DecodeFormatManager.PRODUCT_FORMATS);
            decodeFormats.addAll(DecodeFormatManager.INDUSTRIAL_FORMATS);
            decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
            decodeFormats.addAll(DecodeFormatManager.DATA_MATRIX_FORMATS);
            decodeFormats.addAll(DecodeFormatManager.AZTEC_FORMATS);
        }

        hints.put(DecodeHintType.POSSIBLE_FORMATS, decodeFormats);
        // TODO: 2018/4/8 lzh
        hints.put(DecodeHintType.TRY_HARDER,  Boolean.TRUE);
        hints.put(DecodeHintType.CHARACTER_SET, "utf-8");

        if (characterSet != null)
        {
            hints.put(DecodeHintType.CHARACTER_SET, characterSet);
        }

        hints.put(DecodeHintType.NEED_RESULT_POINT_CALLBACK,
                resultPointCallback);
    }

    Handler getHandler()
    {
        try
        {
            handlerInitLatch.await();
        }
        catch (InterruptedException ie)
        {
            // continue?
        }
        return handler;
    }

    @Override
    public void run()
    {
        Looper.prepare();
        handler = new DecodeHandler(activity, hints, zxingInterface);
        handlerInitLatch.countDown();
        Looper.loop();
    }

}
